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Mergers and acquisitions - Atlantic Capital Bank N.A. Branches - Narrative (Details) $ in Thousands | Apr. 05, 2019 USD ($) branch | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 242,561 | $ 169,051 | $ 137,190
Atlantic Capital |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total purchase price | $ 36,790 |  |  |
Customer deposits | $ 588,877 |  |  |
Deposit premium percentage | 6.25% |  |  |
Loans held for investment, net of fair value adjustments | $ 374,966 |  |  |
Percentage of loans outstanding | 99.32% |  |  |
Goodwill | $ 31,961 |  |  |
Tennessee | Atlantic Capital |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches acquired | branch | 11 |  |  |
Georgia | Atlantic Capital |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches acquired | branch | 3 |  |  |

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